- #1
Sheneron
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Homework Statement
Say something has an amount and it decreases by 20% a year. Let's say the starting amount is 100. Then, after 1 year youd expect the amount to be 80.
The DE x'(t) = -.20x(t) would represent the above comment. I think. (x(t) is a function of the amount after time t.)
However, if you solved that DE and found your function x(t) and plugged in 1 for t, you would not get 80.
Why is this so?